RTP Payload Format media types

In addition to the RTP payload formats (encodings) listed in the RTP
Payload Types table, there are additional payload formats that do not
have static RTP payload types assigned but instead use dynamic payload
type number assignment. Each payload format is named by a registered
media subtype as listed in the following table. As new payload formats
are specified, their registered media subtypes should be added to this
table. In addition, for the payload formats listed in the RTP Payload
Types table above, the "encoding name" is also registered as a media
subtype under the media type "audio" or "video". The clock rate and
number of channels shown here are the normal values for those payload
formats that have a normal value. Both type and subtype names are
case-insensitive as defined in RFC4288.
Registration procedures and a registration template can be found in
[RFC4855]